// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
#define UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_

#include <stdint.h>

#include "base/strings/string16.h"
#include "ui/app_list/app_list_export.h"

namespace app_list {

enum SpeechRecognitionState {
    SPEECH_RECOGNITION_OFF = 0,
    SPEECH_RECOGNITION_READY,
    SPEECH_RECOGNITION_HOTWORD_LISTENING,
    SPEECH_RECOGNITION_RECOGNIZING,
    SPEECH_RECOGNITION_IN_SPEECH,
    SPEECH_RECOGNITION_STOPPING,
    SPEECH_RECOGNITION_NETWORK_ERROR,
};

class APP_LIST_EXPORT SpeechUIModelObserver {
public:
    // Invoked when sound level for the speech recognition has changed. |level|
    // represents the current sound-level in the range of [0, 255].
    virtual void OnSpeechSoundLevelChanged(uint8_t level) { }

    // Invoked when a speech result arrives. |is_final| is true only when the
    // speech result is final.
    virtual void OnSpeechResult(const base::string16& result, bool is_final) { }

    // Invoked when the state of speech recognition is changed.
    virtual void OnSpeechRecognitionStateChanged(
        SpeechRecognitionState new_state) { }

protected:
    virtual ~SpeechUIModelObserver() { }
};

} // namespace app_list

#endif // UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
